#include <Arduino.h>

//Arduino Pins for Segments
int A=2; //BCD pin 11
int B=3; //BCD pin 7
int C=4; //BCD pin 4
int D=5; //BCD pin 2
int E=6; //BCD pin 1
int F=7; //BCD pin 10
int G=8; //BCD pin 5
int DP=9; //BCD pin 3

//Arduino Digit Pins
double D1=10; //BCD pin 12
double D2=11;//BCD pin 9
double D3=12;//BCD pin 8
double D4=13; //BCD pin 6

double digitsarray[4]={0,0,0,0};


unsigned long time_now = 0;

double start_time=1234;
double current_time=start_time;

double end_time=9999;

void mydelay(int y);
void displaynumber(double num);
void displayoff();
void selectdigit(double d);


void setup() {

Serial.begin(9600);
//Pin Set up
pinMode(A,OUTPUT);
pinMode(B,OUTPUT);
pinMode(C,OUTPUT);
pinMode(D,OUTPUT);
pinMode(E,OUTPUT);
pinMode(F,OUTPUT);
pinMode(G,OUTPUT);
pinMode(DP,OUTPUT);

pinMode(D1,OUTPUT);
pinMode(D2,OUTPUT);
pinMode(D3,OUTPUT);
pinMode(D4,OUTPUT);


}



void loop() {
  //digits
digitalWrite(D1,HIGH);
digitalWrite(D2,HIGH);
digitalWrite(D3,HIGH);
digitalWrite(D4,HIGH);

//variables for storing individual digits of current time/value
int value;
int firstdigit;
int seconddigit;
int thirddigit;
int fourthdigit;










Serial.print("Current Time:\n");
Serial.print(current_time);



    value=current_time;

  //divides number into individual digits
    fourthdigit=value%10;
    value=value/10;
    thirddigit=value%10;
    value=value/10;
    seconddigit=value%10;
    value=value/10;
    firstdigit=value%10;

    digitsarray[0]=firstdigit;
    digitsarray[1]=seconddigit;
    digitsarray[2]=thirddigit;
    digitsarray[3]=fourthdigit;





 displayoff();
 selectdigit(1);
 displaynumber(digitsarray[0]);

 mydelay(100);


 displayoff();
 selectdigit(2);
 displaynumber(digitsarray[1]);

 mydelay(100);


 displayoff();
 selectdigit(3);
 displaynumber(digitsarray[2]);

 mydelay(100);


displayoff();
selectdigit(4);
displaynumber(digitsarray[3]);

mydelay(100);






mydelay(600);
 current_time=current_time+1;

}


void mydelay(int y)
{
  time_now = millis();



    while(millis() < time_now + y){

    }
}

void displaynumber(double num)
{
  //mumbers 0-9

  if(num==0)
  {



    digitalWrite(A,HIGH);
    digitalWrite(B,HIGH);
    digitalWrite(C,HIGH);
    digitalWrite(D,HIGH);
    digitalWrite(E,HIGH);
    digitalWrite(F,HIGH);
    digitalWrite(G,LOW);

  }

  if(num==1)
  {
    digitalWrite(A,LOW);
    digitalWrite(B,HIGH);
    digitalWrite(C,HIGH);
    digitalWrite(D,LOW);
    digitalWrite(E,LOW);
    digitalWrite(F,LOW);
    digitalWrite(G,LOW);
  }

  if(num==2)
  {
  digitalWrite(A,HIGH);
  digitalWrite(B,HIGH);
  digitalWrite(C,LOW);
  digitalWrite(D,HIGH);
  digitalWrite(E,HIGH);
  digitalWrite(F,LOW);
  digitalWrite(G,HIGH);
  }

  if(num==3)
  {
  digitalWrite(A,HIGH);
  digitalWrite(B,HIGH);
  digitalWrite(C,HIGH);
  digitalWrite(D,HIGH);
  digitalWrite(E,LOW);
  digitalWrite(F,LOW);
  digitalWrite(G,HIGH);
  }

 if(num==4)
  {
  digitalWrite(A,LOW);
  digitalWrite(B,HIGH);
  digitalWrite(C,HIGH);
  digitalWrite(D,LOW);
  digitalWrite(E,LOW);
  digitalWrite(F, HIGH);
  digitalWrite(G,HIGH);
  }

  if(num==5)
  {
    digitalWrite(A,HIGH);
    digitalWrite(B,LOW);
    digitalWrite(C,HIGH);
    digitalWrite(D,HIGH);
    digitalWrite(E,LOW);
    digitalWrite(F,HIGH);
    digitalWrite(G,HIGH);
  }

   if(num==6)
  {
    digitalWrite(A,HIGH);
    digitalWrite(B,LOW);
    digitalWrite(C,HIGH);
    digitalWrite(D,HIGH);
    digitalWrite(E,HIGH);
    digitalWrite(F,HIGH);
    digitalWrite(G,HIGH);
  }

   if(num==7)
  {
    digitalWrite(A,HIGH);
    digitalWrite(B,HIGH);
    digitalWrite(C,HIGH);
    digitalWrite(D,LOW);
    digitalWrite(E,LOW);
    digitalWrite(F,HIGH);
    digitalWrite(G,LOW);
  }

   if(num==8)
  {
    digitalWrite(A,HIGH);
    digitalWrite(B,HIGH);
    digitalWrite(C,HIGH);
    digitalWrite(D,HIGH);
    digitalWrite(E,HIGH);
    digitalWrite(F,HIGH);
    digitalWrite(G,HIGH);
  }

   if(num==9)
  {
    digitalWrite(A,HIGH);
    digitalWrite(B,HIGH);
    digitalWrite(C,HIGH);
    digitalWrite(D,HIGH);
    digitalWrite(E,LOW);
    digitalWrite(F,HIGH);
    digitalWrite(G,HIGH);
  }


}

void displayoff()
{
    //turns all segments off
    digitalWrite(A,LOW);
    digitalWrite(B,LOW);
    digitalWrite(C,LOW);
    digitalWrite(D,LOW);
    digitalWrite(E,LOW);
    digitalWrite(F,LOW);
    digitalWrite(G,LOW);


}

void selectdigit(double d)
{
digitalWrite(D1,HIGH);
digitalWrite(D2,HIGH);
digitalWrite(D3,HIGH);
digitalWrite(D4,HIGH);

//switches the selected digit to turn on
switch((int) d)
{
    case 1:
    digitalWrite(D1, LOW);
    break;
    case 2:
    digitalWrite(D2, LOW);
    break;
    case 3:
    digitalWrite(D3, LOW);
    break;
    case 4:
    digitalWrite(D4, LOW);
    break;

}

}